Path

Enable Debugging-Output

If you are new to hibernate4-maven-plugin, in many cases, the
{Configuration-Method-Precedence} may be the source of configuration
errors.
To solve this problem, you should run maven with the debugging output
enabled.
For example, by executing:

mvn -X compile hibernate4:export

(The compile might be necessary, because hibernate4-maven-plugin
has to scan the compiled classes for annotations!)

Unlike the majority of the maven-plugins, hibernate4-maven-plugin was
designed to give a good many hints, when debugging is enabled.
Because, if you do not know, what went wrong, you can't fix it!